So i cant boil a total of water to equal the full 5 gallon batch. So this being said wat is if any problems with not hitting that 5 gallon mark on point. I just finished a brew and after i airated im a little over cause of the bubbles.

Nothing wrong with boiling as much as you can and then topping up to 5 gal after the boil. You gravity reading should be your guide on how much you top up to. If you don't have a hydrometer, they are cheap and very useful. Odds are you're probably fine if you are close to 5 gallons though.

If you are 1 milliliter over or under your beer will be ruined. Better get it EXACTLY to 5 gallons.

Naw, I'm just kidding. I usually eyeball it with the markings on my bucket. I wouldn't sweat it being slightly over or under. Now, don't be 1/2 gallon over or under, unless it makes sense for your gravity reading. As suggested, I highly recommend taking gravity readings to know where you stand with your beer. Good luck!